1. Runners in the Peachtree Road Race line up for 1 mile to start the race. If each person needs 2.5 square feet of space, approximately how many people are there if the road is 60 feet wide?

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256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)